Re: VLF: EbNaut transmission, first try: 8,27kHz

[Markus Vester <markusvester@aol.com>]

Hi Roland,

sorry no unambiguous result yet. Playing around with the parameters, I got "R3" as the "best" decode with up to 0.5 dB Eb/N0, but also "NK", "E>", and other likely false ones.

Your last carrier transmission was relatively strong here, and the EbNaut transmission even seems to have left a visible haze in my "6000" grabber window. So for the next test, I would recommend to use a much shorter sequence (e.g. 2 char, 20 seconds). Such a short message will easily fit into the morning low-QRN period, and greatly reduce the effect of frequency uncertainties and the likeliness of soundcard phase glitches.

Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: Roland Bruestle <r@mbsks.franken.de>
An: Markus Vester <markusvester@aol.com>; MW500_rsgp <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 17 Mai 2016 7:15 am
Betreff: Re: EbNaut transmission, first try: 8,27kHz

Guten Morgen Markus,
sorry Markus, I start again. The frequency synchronization was not switched on.

new Start time:    17.05.2015  5.30 UTC
f:                        8270Hz
Symbol length:     100s
Characters:          2
CRC 16
8K191

viele Grüße
Roland

...

   

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